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TB 103 1996 SC 14 WG 14.05 Commutation failures. Causes and consequences.

Many aspects of the impact and role of the HVDC system on the rest of the power system can be studied and analysed without a detailed knowledge of the actual design and behaviour of the conversion process taking place in the HVDC convertors, but a more detailed scrutiny of a number of phenomena requires a more detailed knowledge and modelling of the HVDC system and of the DC conversion process.

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TABLE OF CONTENTS

1 INTRODUCTION

2 THE D.C. CONVERSION PROCESS

      2.1 The Commutation Process

3 COMMUTATION FAILURES

      3.1 Basic Descriptions of the Phenomenon

      3.2 Causes of Commutation Failures

      3.3 Impact of earth faults in a.c. systems on voltages across valves

      3.4 Mitigation of Commutation Failures

      3.5 Recovery from Commutation Failures

      3.6 Different types of schemes

4 SIMULATION OF COMMUTATION FAILURES USING THE CIGRE BENCHMARK MODEL 19

      4.1 Simulation model

      4.2 Valve voltages and currents during commutation failure

      4.3 Active and reactive power during commutation failures and recoveries

5 EXPERIENCES AND ANALYSES FROM SCHEMES IN OPERATION

      5.1 Gotland

      5.2 Nelson River

      5.3 Rihand-Dadri

6 CONCLUSIONS

7 REFERENCES

8 TABLES